Composite Flexural Behavior of Full-Scale Concrete-Filled Tubes without Axial Loads
Publication: Journal of Structural Engineering
Volume 136, Issue 11
Abstract
Most prior experimental research on the composite behavior of concrete-filled tubes (CFTs) in flexure has been performed using minimodels. The conclusions that have been reached based on the prior research stipulate that the interaction between the concrete and the steel is maximized by steel tube walls confining the concrete, rendering the addition of shear connectors unnecessary. The goal of the current study is to examine the composite flexural behavior of full-scale CFTs, which could be used in actual construction. Four, full-scale, 20-ft- (6-m)-long simple-supported CFT beams were tested under four-point loads. Two were rectangular with a width of 12 in. (305 mm) and the other two beams were circular with a diameter of 18 in. (457 mm). Load, deflection, steel strain, and concrete movement were digitally recorded, and the concrete cracks in each section were mapped and photographed. Test results showed that composite action was improved by shear connectors particularly for circular CFT beams and that the AISC nominal moment capacity prediction was not conservative for circular CFT beams without shear connectors.
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Acknowledgments
The work presented in this paper was funded by the University of Oklahoma (OU), Norman, Oklahoma. The steel tubes used for test specimens and the steel spreader beam were donated by the W&W Steel Corporation and the concrete by the Dolese Bros. Co., both in Oklahoma City, Oklahoma. The testing was conducted in the Donald G. Fears Structural Engineering Laboratory at OU. The writers would like to acknowledge the OU Fears Laboratory Staff, Mike Schmitz, and OU Research Assistants Woosuk Kim, Kah Mun Lam, and Michael Van Zandt, for their assistance. Also, Dr. Cheol-Ho Lee, Professor of Seoul National University, and Dr. Frank Hatfield, Professor Emeritus of Michigan State Univeristy are appreciated for their willing discussion. The views expressed are those of writers and do not necessarily represent those of the sponsor or discussants.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 136 • Issue 11 • November 2010
Pages: 1401 - 1412
Copyright
© 2010 ASCE.
History
Received: Jul 7, 2009
Accepted: Apr 18, 2010
Published online: Apr 30, 2010
Published in print: Nov 2010
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